Distorting one corner of a sculpted wall
There isn't any Distort tool in Blender since mesh is not an image and it can't be transformed that easily however you can work with modifiers and edit mesh data depending on another mesh, basically transforming one according to vertices of another one.
First prepare the dummy mesh which will be used as a cage
Add a cube or extruded plane (since in your case wall object is flat surface) and scale it so that it roughly matches your wall but is slightly bigger. Note that dummy object has to be closed one (no holes and preferably as little details as possible; default cube should do fine). Position it on the same place as your high density wall object (like when baking normals to lowpoly).
Then grab the high density mesh you have and add a Mesh Deform modifier to it
Since it requires vertex group enter Edit mode, select all vertices and add them to new vertex group (shortcut Ctrl+G).
Then in modiifier settings choose that vertex group, select dummy object to act as transforming cage.
Finally in Mesh Deform modifier settings click Bind
Note that this operation can take a while depending on mesh complexity and hardware resources you have.
Then once it's binded in Object mode select cage object, enter Edit mode for it, select vertices in one corner (to match your example) and grab them towards another corner. High density mesh will follow their transformation.

Note that additionally you can hook vertices of the cage object (cube) to an empty  and grab empty in Object mode in order to skip entering Edit mode for the cage (which can be computational heavy operation).
See more about Mesh Deform